Page 1 of 2

My Finished Hybrid

Posted: Sat Nov 25, 2006 5:38 pm
by mark.f
In my everlasting quest for honesty, ( :P ), I will tell you that I didn't re-write this at all. I just copied the post I made on SpudTech here. :oops:

------------------------------------------------------------------------------------

Mark's Gen. II Hybrid Gun
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
back-system.jpg
system-overview.jpg
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

After much talking and tweaking, I have my hybrid up and running.

The hybrid is a generation II variant. The chamber is 1-1/4 x 8" SCH-80 seamless steel pipe, and the fittings on the chamber can each hold at least 3,000 PSI. The mix tank is 2x12" SCH-40 and the two are separated by a ball valve.

I originally planned this thing to be a sort of rifle, and was going to make an onboard water pump and everything. But, after much though, effort, money, and experimentation, I just couldn't make it all compact enough. So, here she is:

I fill the whole thing to a 2x/2 atm mix, (more to mix the fuel than anything), and then open the hose into the mix tank to pressurize the ignition chamber even further. Then, the ball valve is closed and the chamber is ignited.

I use three layers of aluminum foil as a burst disk, and I shoot 13/32" steel ball bearings out a 3/8" type L copper pipe 36" long. I had to add a gasket to both the union and the hose adapter, because they were leaking like sieves.

The ignition is installed by drilling two small holes through a piece of 1/4" OD anodized aluminum rod, and then passing them through and epoxying into place. Then, the rod segment is attached to the chamber with a 1/4" OD compression adapter. The igniter is placed inside a small ring of 3/4" SCH-40 which is pressed into a 1" hole bored through the base.

The base is simply two pieces of 2x6 which have been glued together, sanded, charred, and then coated in polyurethane which is used for wood flooring. The spacers are all cut from 2x6 and the entire thing is strapped together with a 13' cargo ratchet strap which was cut to the correct length.

Farthest I've taken the launcher to was 60 PSI compression. This one fired with a pretty loud POP and I didn't quite figure out what the ball hit. I think it hit our oak tree, so I'll check there later. I have a small video at the bottom, (no sound, sorry), of a 40 PSI compression shot.

Now, here are all of the photos...
chamber-in.jpg
chamber-in.jpg (39.29 KiB) Viewed 2022 times
A view of a burst disk after being subjected to a 40 PSI compression shot
A view of a burst disk after being subjected to a 40 PSI compression shot
drain.jpg
far-away-full.jpg
far-away-full.jpg (16.37 KiB) Viewed 2022 times
front-system.jpg
front-system.jpg (38.64 KiB) Viewed 2022 times
Where the garden hose connects to the mixing tank
Where the garden hose connects to the mixing tank
The BBQ igniter
The BBQ igniter
Where I inject propane, inject air, and where the Oh Shit! hose connects to the mixing tank
Where I inject propane, inject air, and where the Oh Shit! hose connects to the mixing tank
side-system.jpg
I'm pretty sure I left something out, so ask your questions!!!!

Thanks,
~Mark

Posted: Sat Nov 25, 2006 5:52 pm
by rna_duelers
What speed does it shoot at?And maybe loose the yellow tape for something a little different.Makes the gun look a little bit of a throw together.

Posted: Sat Nov 25, 2006 5:59 pm
by mark.f
I have no clue what speed it shoots at. Probably a little over ~600 fps, (a good pneumatic's speed).

As for the yellow stuff, that's not tape. :wink: It's cargo strapping for tying things like boats or ATV's to trailers. I chose it because I could use one continuous length and because it's easy to undo if I ever need to get to any of the components on the launcher.

Posted: Sat Nov 25, 2006 6:11 pm
by rna_duelers
Ahh fair enough reason.Could you access a chronygraph.Because I would like to see the sound barrier broken again.

Have you had any other problems apart from the union thinking it was a sieve?

Posted: Sat Nov 25, 2006 6:16 pm
by mark.f
Nope. Just had to do a volume measurement twice because the first time I spilt water all over the place.

I could probably access a chronograph. One of my buddies is really into paintball, so he may have one. If not, my uncle is into handloading rifle rounds, so he may as well. Don't think I'll be breaking the speed of sound anytime soon, though, unless I buy a longer barrel.

GalFisk wants a night-time video to see muzzle flash, so I'll get that up in a little bit.

Posted: Sat Nov 25, 2006 6:27 pm
by Jedwards
What did you use for your air input? Is it from an ordinary push bike?

Posted: Sat Nov 25, 2006 7:15 pm
by mark.f
Yes, it's from a bike pump.

Posted: Sat Nov 25, 2006 7:22 pm
by schmanman
I like it. how much were all the fittings?

Posted: Sat Nov 25, 2006 7:25 pm
by Scope
Most paintball chronographs wont go over 450 unless he has a really nice one

Posted: Sat Nov 25, 2006 7:31 pm
by mark.f
All the chamber and barrel fittings totalled $117.

Thanks for the info scope. I guess it'll be good old uncle mike then...

Posted: Sat Nov 25, 2006 8:04 pm
by schmanman
oh, not too bad. kinda off topic, but what is the most you've spent on a gun? for me, it's $450-500 bucks, and rising.

Posted: Sat Nov 25, 2006 8:13 pm
by PVC Arsenal 17
So far the omega is getting close to $250.

My Grandparents are always willing to help fund my projects though! They enjoy watching me destroy things as much as I do!

I'm guessing the $500 was for the swat gun?

Posted: Sat Nov 25, 2006 8:19 pm
by SpudStuff
500 dollars! Man you got screwed. That would have cot me ~$75-100.

Posted: Sat Nov 25, 2006 8:29 pm
by Scope
Great job by the way man!!!!

Posted: Sat Nov 25, 2006 8:52 pm
by mark.f
Most I've spent is about 150$ for the Last Blast. This thing was cheaper due to the interchangeable meter input.